John blake tare



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Letters Patent No. 70,482, dated November 5, 1867.

IMPROVED MOULD FOR CASTING GAR-WHEELS.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN Brinks TARD., of Chicago, in thc county of Cook, and State of" Illinois, have invented an improvement in Moulds for Casting Steel; and I do hereby declare that the following is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, in which- Figure lis an elevation of one side of the machine, with the parts arranged and held in position for receiving the metal.

Figure 2 is a section taken in a vertical plane through the centre of the lower portion of themould, with the parts in position for receiving the melted metal. v

Similar letters of reference indicate correspondingr parts in the several figures. l

This invention relates to an improvement on the construction of moulds which are designed especially for use in producing castings of cast steel. In consequence'of the intensedegree of heat required to melt cast steel, none ofthe ordinary substances for moulds will answer the purpose, as such substances are quickly burned out and destroyed. In producing compressed cast-steel castings the moulds require to be made very strong and substantial, in order to withstand the pressure which it is necessary to apply to the metal while in the moulds in a liquid state; for which purpose I have constructed moulds of iron with blocks of plumba-go inserted into one ofthe sections beneath the spruc or pouring-holes. By this means the objpction above mentioned was in part remedied, but the moulds were subject to destruction except at the points protected by the refractory substance.

The object of this invention is to so construct moulds in which to make steel castings that they shall not be subject to destruction by heat, at the same time to make them sufficiently strong to safely stand all the pressure which it may be required to apply to the metal poured in.them, as will be hereinafter described.

To enable others skilled in the art to understand my invention, I will describe its construction and operation.

In the accompanying drawings I have represented one mode of carrying out my invention, and shown a mould which is adapted for producing compressed cast-steel car-wheels; but I do not confine my invent-ion to the casting of car-wheels, as other objgects can be produced by changing the form of the moulds. A represents the bed of the mould for making car-wheels, which is constructed with ann'ular depressions in its faces, in the lower one of which is seated and firmly secured a block, B, of soap-stone, plumbago, or other suitable refractory substance which will -n'ot be materially injured by steel when poured upon it in a melted state. This block I3 has a hole, a, through its centre, for receiving a core, C, and its upper face is shaped so as to produce the form of one side of a car-wheel, as shown in fig. 2. The metallic bed-plate A is designed to ser-ve as the bed of. the machine, and also as a means of supporting the block B, and preventing it from cracking or crumbling under the pressure to'which it is-subjected. The upper depression in the face of said bed-plate is designed for receiving aring which is also composed of metal and a refractory substance. This ring, when in place, is seated and centred within said depression, and its interior lining, D, is shaped so as to produce a part of the ange of the wheel, and also the rim or periphery thereof. This lining is sustained and strengthened by mean's of' the metallic ring or casing D', which encloses its top and outer surfaces, leaving its interiorand bottom surfaces exposed. The'external surface of the wheel is produced by means of a circular block, E, of refractory substance, properly shaped on its bottom surface, and protected by means of a strong metallic cap, F, to which it is secured in any suitable manner. This block and its plate I shall denominate a plunger, as it is connected by means of rods or otherwise with the mechanical power employed for compressing the metal poured into the mould. A hole is made through the centre of this plunger, for receiving the core C for producing the eye or hole through the centre of the wheel, as shown in iig. 2.

It will be seen from the above description, taken in connection with the accompanying drawings, that those parts of the mould which produce the carfwheel, and upon which the melted steel Hows, are composed of a substance which will not be burned or destroyed by the heat of such metal, and that this substance isflrmly Supported against the strain to which it is subjected in the act of compressing the metal. The method of compressing the metal While in the mould in a melted state, and the advantages of such compression, together with the method of manipulating the mould-sections and withdrawing the core C, are fully set forth in my lettere patent granted on the day of y 186 K I am aware that refractory substances have been used inthe construction of moulds in which to cast steel,

aud that in onevinstancc a portion of a. mould has been made of a composition of plumbago and soap-stone mixedwith silica, and I do not claim broadly the use of a refractory substance of'whicli to construct moulds for casting. Neither do I confine myself to the use of socp-stone, although I prefer using this substance, for' plumbago, or a, composition of substances which will not be readily destroyed by intense heat, may be used.

What I claim as new, and desire to secure by Letters Patent, is- A lining of the form of :L cer-wheel, made of soap-stone or other analogous solid refractory material, in

combination with a tlng sectional metal casing, such lining being in sections and applied Within the sectional metal casing, so as g c adapted forgiving frm to a cast-steel car-wheel, and the casing and liningof such strength combined as to be capable of' sustaining the pressure which is requisite to insure a, condensation' of the steel of which the Wheel is cast, all substantially as herein set forth.

JOHN BLAKE TARE.

Witnesses: t

EDW. Summen, EDM. F. BROWN. 

